( xi ) 



(a) The tubes at the entrance of the burrows of Odynerus 

 reniformis and 0. spinipes to show their close similarity. 



(b) The cells of Odynerus herrichi. 



(c) The cells of Eumenes coarctata. 



(d) The cells of Osmia rufa found in an old hive showing 

 how the hexagonal cells had been enlarged and adapted by 

 the Osmia. 



(e) The cells of Osmia xanthomelana. 



(/) The cells of Osmia leucamelana in a bramble stem with 

 Stelis octomaculata, and an imprisoned male at bottom of the 

 burrow. 



He also exhibited examples of Cimbex and its allies, in 

 illustration of Mr. Morice's succeeding exhibit. 



The Saws of various Cimbicids. — The Eev. F. D. Morice 

 exhibited, with the Epidiascope, a series of photo-micrographs 

 to illustrate specific characters in the ? ovipositors or 

 " saws " of various Cimbicids, especially of the genus Trichio- 

 soma, Leach, but also of Cimbex, Pseudoclavellaria, Abia, 

 and Corynis (= Amasis). 



Pupal Paddles of Mosquitoes.— Mr. A. Bacot exhibited 

 a series of lantern slides showing outline camera drawings 

 of preparations of the anal fins or paddles of mosquito pupae 

 (see list below). He called attention to the possibilities 

 afforded by these characters for the separation and identifi- 

 cation of species closely resembling each other in the adult 

 stage. Although it did not seem probable at present that 

 the pupae could be made the basis of a scheme of classifica- 

 tion, still, when a large number had been examined, this 

 might follow, as had happened with the genitalia of the 

 Lepidoptera, which were at first used as a means of separation 

 in difficult cases. 



The extremes of variation as shown between the paddles 

 of Eretmopodites quinquevittatus and E. chrysogaster, species 

 in which it was difficult to distinguish between the females 

 (although the males of chrysogaster were easily separated by 

 the tuft of scales on the third pair of legs), had led him to 

 examine the pupae of as many species as possible, with the 

 result that a new species, Eretmopodites dracaenae, Edwards, 



